What were the Puritans experts on?
The Puritans were experts on the Bible. As their name implies, they sought to purify the Church of England by insisting on returning to the Bible in their forms of worship. Therefore, they were generally far more literate than other people of their age (so they could read the Bible themselves and not just hear it preached out in church), and they founded universities and schools when they went to New England. One such institution was Harvard College, founded in 1636, which was initially founded to train clergy. The college had the first printing press in North America. The Puritans did not necessarily believe in creativity, though the poem "To My Dear and Loving Husband" by Anne Bradstreet is an example of a creative piece of literature written by a Puritan poet. They were, however, known for their adherence to the Bible.
I would say the Puritans were experts on the Bible, or at least their interpretation of it. They did not beleive in creativity. They certainly did not appreciate the arts, and they were appalled by Pagan traditions.